_The thirteenth_ Experiment, _Of compounding several Colours by Trajecting
the Sun-beams through Ting'd Glasses_ (from 221 to 224).

_The fourteenth_ Experiment, _Of the Compounding of Real and Phantastical
Colours, and the Results_ (224, 225, 226.) _as also the same of
Phantastical Colours_ (226, 227.)

_The fifteenth_ Experiment, _Of Varying the Trajected_ Iris _by a Colour'd
Prism_ (228, 229.)

_The sixteenth_ Experiment, _Of the Red fumes of Spirit of_ Nitre, _and,
the resembling Redness of the Horizontal Sun-beams_ (230, 231.)

_The seventeenth_ Experiment, _Of making a Green by nine Kinds of
Compositions_ (from 231 to 236.) _And some Deductions from them against the
necessity of recurring to Substantial forms and Hypostatical principles for
the production of Colours_ (from 237 to 240.)

_The eighteenth_ Experiment, _Of several Compositions of Blew and Yellow
which produce not a Green, and of the production of a Green by other
Colours_ (241, 242.)

_The nineteenth_ Experiment, _contains several instances of producing
Colours, without the alteration of any Hypostatical principle, by the
Prism, Bubbles, and Feathers_ ( from 242 to 245.)

_The twentieth_ Experiment _Of turning the Blew of Violets into a Red by
Acid Salts, and to a Green by Alcalizate (245, 246.) and the use of it for
Investigating the Nature of Salts_ (247, 248.)